lkml.org 
[lkml]   [2008]   [Aug]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: in 2.6.23-rc3-git7 in do_cciss_intr
James Bottomley wrote:
> On Fri, 2008-08-22 at 15:48 +0000, Miller, Mike (OS Dev) wrote:
>>> -----Original Message-----
>>> From: Randy Dunlap [mailto:randy.dunlap@oracle.com]
>>> Sent: Thursday, August 21, 2008 7:27 PM
>>> To: Miller, Mike (OS Dev)
>>> Cc: lkml; scsi; akpm
>>> Subject: Re: in 2.6.23-rc3-git7 in do_cciss_intr
>>>
>>> On Thu, 21 Aug 2008 16:25:24 +0000 Miller, Mike (OS Dev) wrote:
>>>
>>>>>> Randy,
>>>>>> We know of a race condition in cciss_init_one. It's fixed
>>>>> in 2.6.26 I believe. Here's the patch:
>>>>>>
>>> http://groups.google.com/group/linux.kernel/browse_thread/thread/7b3
>>>>> 9f
>>> 2b77622ab03/4f5f45c008655ca1?hl=en&lnk=gst&q=cciss#4f5f45c008655ca
>>>>>> 1
>>>>>
>>>>> Mike,
>>>>> Sorry, but my fingers have typoed the $subject. My bad.
>>>>> Kernel is 2.6.27-rc3-git7 (from above):
>>>>>
>>>>>>>>> Modules linked in: cciss(+) ehci_hcd ohci_hcd uhci_hcd
>>>>>>>>> Pid: 0, comm: swapper Not tainted 2.6.27-rc3-git7 #1
>>>>>>>>> RIP: 0010:[<ffffffffa001bb68>] [<ffffffffa001bb68>]
>>>>>>>>> do_cciss_intr+0x627/0xa6c [cciss]
>>>> Hmmmmm, let me know what happens from your retest. I'll
>>> look at this
>>>> as soon as I finish what I'm doing now. We trying to spin
>>> for our test
>>>> teams but I have something hopelessly broken. :(
>>> It didn't BUG in the retest. That just means that it's more
>>> difficult to find/fix, right?
>> Yup.
>
> Randy,
>
> If you can't reproduce it, could you use the debug information or gdb to
> tell us what line in the source code this:
>
> do_cciss_intr+0x627
>
> corresponds to? That might help isolating the problem.


Sure, here's an attempt at that. Please let me know if you want it
differently or some other info.

(gdb) x/20i do_cciss_intr+0x627
0x3b68 <do_cciss_intr+1575>: mov %rdx,0x248(%rax)
0x3b6f <do_cciss_intr+1582>: mov 0x248(%rbx),%rdx
0x3b76 <do_cciss_intr+1589>: mov %rax,0x240(%rdx)
0x3b7d <do_cciss_intr+1596>: jmp 0x3b8b <do_cciss_intr+1610>
0x3b7f <do_cciss_intr+1598>: movq $0x0,0x100c0(%r12)
0x3b8b <do_cciss_intr+1610>: mov 0x234(%rbx),%eax
0x3b91 <do_cciss_intr+1616>: test %eax,%eax
0x3b93 <do_cciss_intr+1618>: jne 0x3f27 <do_cciss_intr+2534>
0x3b99 <do_cciss_intr+1624>: mov 0x250(%rbx),%r14
0x3ba0 <do_cciss_intr+1631>: movl $0x0,0xcc(%r14)
0x3bab <do_cciss_intr+1642>: mov 0x228(%rbx),%r8
0x3bb2 <do_cciss_intr+1649>: mov 0x2(%r8),%dx
0x3bb7 <do_cciss_intr+1654>: test %dx,%dx
0x3bba <do_cciss_intr+1657>: je 0x3f0e <do_cciss_intr+2509>


$ addr2line -e cciss.o -f do_cciss_intr+0x627
SA5_fifo_full
/home/rdunlap/linsrc/linux-2.6.27-rc3-git7/drivers/block/cciss.h:206



$ ../../scripts/decodecode < cciss.code
Code: 8b 83 48 02 00 00 48 39 d8 74 37 49 39 9c 24 c0 00 01 00 75 08 49 89 84 24 c0 00 01 00 48 8b 83 40 02 00 00 48 8b 93 48 02 00 00 <48> 89 90 48 02 00 00 48 8b 93 48 02 00 00 48 89 82 40 02 00 00

/tmp/tmp.HbrjP23089.o: file format elf64-x86-64

Disassembly of section .text:

0000000000000000 <.text>:
0: 8b 83 48 02 00 00 mov 0x248(%rbx),%eax
6: 48 39 d8 cmp %rbx,%rax
9: 74 37 je 0x42
b: 49 39 9c 24 c0 00 01 cmp %rbx,0x100c0(%r12)
12: 00
13: 75 08 jne 0x1d
15: 49 89 84 24 c0 00 01 mov %rax,0x100c0(%r12)
1c: 00
1d: 48 8b 83 40 02 00 00 mov 0x240(%rbx),%rax
24: 48 8b 93 48 02 00 00 mov 0x248(%rbx),%rdx
/tmp/tmp.HbrjP23089.o: file format elf64-x86-64

Disassembly of section .text:

0000000000000000 <.text>:
0: 48 89 90 48 02 00 00 mov %rdx,0x248(%rax)
7: 48 8b 93 48 02 00 00 mov 0x248(%rbx),%rdx
e: 48 89 82 40 02 00 00 mov %rax,0x240(%rdx)

~Randy


\
 
 \ /
  Last update: 2008-08-22 18:55    [W:0.085 / U:0.364 seconds]
©2003-2014 Jasper Spaans. Advertise on this site